Re: [PATCH v2 2/9] drm/i915: Use memcpy_[from/to]_page() in gem/i915_gem_pyhs.c

[Ira Weiny]

Zhao Liu wrote:
> From: Zhao Liu <zhao1.liu@xxxxxxxxx>
> 
> The use of kmap_atomic() is being deprecated in favor of
> kmap_local_page()[1],  and this patch converts the call from
> kmap_atomic() + memcpy() to memcpy_[from/to]_page(), which use
> kmap_local_page() to build local mapping and then do memcpy().
> 
> The main difference between atomic and local mappings is that local
> mappings doesn't disable page faults or preemption (the preemption is
> disabled for !PREEMPT_RT case, otherwise it only disables migration).
> 
> With kmap_local_page(), we can avoid the often unwanted side effect of
> unnecessary page faults and preemption disables.
> 
> In drm/i915/gem/i915_gem_phys.c, the functions
> i915_gem_object_get_pages_phys() and i915_gem_object_put_pages_phys()
> don't need to disable pagefaults and preemption for mapping because of
> 2 reasons:
> 
> 1. The flush operation is safe. In drm/i915/gem/i915_gem_object.c,
> i915_gem_object_get_pages_phys() and i915_gem_object_put_pages_phys()
> calls drm_clflush_virt_range() to use CLFLUSHOPT or WBINVD to flush.
> Since CLFLUSHOPT is global on x86 and WBINVD is called on each cpu in
> drm_clflush_virt_range(), the flush operation is global.
> 
> 2. Any context switch caused by preemption or page faults (page fault
> may cause sleep) doesn't affect the validity of local mapping.
> 
> Therefore, i915_gem_object_get_pages_phys() and
> i915_gem_object_put_pages_phys() are two functions where the uses of
> local mappings in place of atomic mappings are correctly suited.
> 
> Convert the calls of kmap_atomic() / kunmap_atomic() + memcpy() to
> memcpy_from_page() and memcpy_to_page().
> 
> [1]: https://lore.kernel.org/all/20220813220034.806698-1-ira.weiny@xxxxxxxxx
> 
> v2:
> * Used memcpy_from_page() and memcpy_to_page() to replace
>   kmap_local_page() + memcpy().
> * Dropped hot plug related description since it has nothing to do with
>   kmap_local_page().
> * Added description of the motivation of using kmap_local_page().
> 
> Suggested-by: Dave Hansen <dave.hansen@xxxxxxxxx>
> Suggested-by: Ira Weiny <ira.weiny@xxxxxxxxx>

Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>